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50 lines
1.4 KiB
Text
50 lines
1.4 KiB
Text
(defmodule unit-maybe-monad-tests
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(export all)
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(import
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(from lfeunit-util
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(check-failed-assert 2)
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(check-wrong-assert-exception 2))))
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(include-lib "deps/lfeunit/include/lfeunit-macros.lfe")
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(include-lib "include/monads.lfe")
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(include-lib "include/monad-tests.lfe")
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(test-monad maybe-monad)
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(deftest bind-short-circuit-value
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(is-equal 'nothing
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(>>= maybe-monad 'nothing
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(lambda (x) (+ 5 x)))))
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(deftest bind-short-circuit-error
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(is-equal 'nothing
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(>>= maybe-monad 'nothing
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(lambda (_) (error 'bad-func)))))
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(deftest bind
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(is-equal 10
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(>>= maybe-monad (tuple 'just 5)
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(lambda (x) (+ 5 x)))))
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(deftest bind-fold
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(is-equal #(just 3)
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(let ((minc (lambda (x) (return maybe-monad (+ 1 x))))
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(bind (lambda (f m) (>>= maybe-monad m f))))
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(lists:foldr bind
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#(just 0)
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(list minc
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minc
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minc)))))
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(deftest do-bindings
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(is-equal #(just 3)
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(do maybe-monad
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(a <- #(just 1))
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(b <- #(just 2))
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(return maybe-monad (+ a b)))))
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(deftest do-nobindings
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(is-equal #(just 3)
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(do maybe-monad
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#(just 5)
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#(just 3))))
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